Example from USGS OFR-418 of Penland et al. 2001.

Example from USGS OFR-418 of Penland et al. 2001.

(Credit: USGS. Public domain.)

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Example from USGS OFR-418 of Penland et al. 2001.

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Image Dimensions: 1148 x 900

Date Taken: Monday, April 25, 2016